Long Lake vs Portage Lake
Water quality, depth, fish species, and recreation comparison.
Long Lake has a higher water quality grade (A, Excellent) than Portage Lake (B, Good). Both are in Cass County, Minnesota.
A
Long Lake
Cass County, Minnesota
Crystal clear, you can see 21.8 ft down.
B
Portage Lake
Cass County, Minnesota
Moderate clarity, visible to about 7.5 ft.
Side-by-Side Metrics
| Metric | Long Lake | Portage Lake |
|---|---|---|
| Overall Grade | A (Excellent) | B (Good) |
| Water Clarity | 21.8 ft | 7.5 ft |
| Phosphorus | 9 µg/L | 23 µg/L |
| Chlorophyll-a (Algae) | No data | 6.1 µg/L |
| Maximum Depth | 115 ft | 55 ft |
| Surface Area | 1.0K acres | 1.5K acres |
| Public Access | Yes | Yes |
| Fish Species | 14 | 15 |
| Trophic State | oligotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Long Lake wins on overall water quality with a Grade A versus Portage Lake's Grade B. Water clarity: 21.8 ft vs 7.5 ft. For more fish-species variety, Portage Lake edges ahead with 15 documented species.